I have a Arduino BT and want to make analog data aquisition. I have read in arduino site If I want to make ADC, I will have to enable pull-up resistors first with this commands :pinMode(A0, OUTPUT);digitalWrite(A0, HIGH);Here is my question: How can I set my analog pins as inputs [besides the pinMode(adcPin, INPUT) command]. I would like to know if necessary the [digitalWrite(A0, HIGH); // set pullup on analog pin 0] commad.

First of all thanks for your answers.[ch921] work with an ECG and I wish to convert its analog signal to digital. ECG's output gives me 2VDC and I wonder if this voltage level is high enough in order to be read by the Arduino [ch914][ch932] that I own. I have write this ADC code with time stamps: